error: no matching function for call to QtConcurrent::run()

[been_1990]

error: no matching function for call to 'run(Widget* const, bool (Widget::*)(bool))'
     QFuture<void> future = QtConcurrent::run(this, &Widget::loadMenuItems);
                                                                        ^

error: no matching function for call to 'run(Widget* const, bool (Widget::*)(bool))'
     QFuture<void> future = QtConcurrent::run(this, &Widget::loadMenuItems);
                                                                        ^

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Defined in header as:

bool loadMenuItems(bool reload=false);

bool loadMenuItems(bool reload=false);

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Widget.cpp:

Widget::Widget(QWidget *parent) :
    QLineEdit(parent)
{
 
    QFuture<void> future = QtConcurrent::run(this, &Widget::loadMenuItems);
    future.waitForFinished();
 
}

Widget::Widget(QWidget *parent) :
    QLineEdit(parent)
{

    QFuture<void> future = QtConcurrent::run(this, &Widget::loadMenuItems);
    future.waitForFinished();

}

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I am following the example in the docs, but I keep getting this error.